Meet Ivanka Trump’s Son Joseph Frederick

Just one day after welcoming her second child into the world, Ivanka Trump and hubby Jared Kushner were ready to show the little guy off.

The 31-year-old daughter of mogul Donald Trump, posted a photo of her newborn son in her arms at the hospital along with the baby's birth announcement on her Tumblr account.

"With love we welcome our son, Joseph Frederick Kushner," she wrote, revealing he was born at 9:54 p.m. birth on Monday.

Joseph Frederick, who joins big sis Arabella, is named after both of his parents' paternal grandfathers.

"Jared’s grandfather, Joseph, was a rock," Trump writes. "His indomitable spirit, his sense of family, and his work ethic are the values we hope to hand down to our son. My grandfather, Frederick, was a builder not just of tens of thousands of homes throughout this city, but of a tight-knit family that honors to this day the traditions he established."

Trump followed a tradition set by her brother, Donald Jr., who named his youngest son Spencer Frederick after their grandpa. "Congrats to @IvankaTrump & @Jared Kushner on the birth of their baby boy last night. Kai Donnie Tristan & Spencer can't wait to play w/ him," Donald Jr. tweeted on Monday, referring to Joseph's four cousins in his message of congrats.

Proud grandpa, The Donald, also took to Twitter to announce his excitement over the news, writing, "My beautiful daughter Ivanka just had a healthy baby boy. Jared and Ivanka are very proud."

But they weren't the only family members excited about the new arrival. Ivanka also shared an adorable photo of 2-year-old Arabella holding her new brother, with the caption, "such a proud big sister!"